Effect of Microstructure of Quantum Dot Layer on Electroluminescent Properties of Quantum Dot Light Emitting Devices

Title
Effect of Microstructure of Quantum Dot Layer on Electroluminescent Properties of Quantum Dot Light Emitting Devices
Authors
윤성룡전민현이전국
Keywords
quantum dot LEDs; inorganic semiconductor; spin-coating; electroluminescence; planar lighting
Issue Date
2013-08
Publisher
한국재료학회지
Citation
VOL 23, NO 8, 430-434
Abstract
Quantum dots(QDs) with their tunable luminescence properties are uniquely suited for use as lumophores in light emitting device. We investigate the microstructural effect on the electroluminescence(EL). Here we report the use of inorganic semiconductors as robust charge transport layers, and demonstrate devices with light emission. We chose mechanically smooth and compositionally amorphous films to prevent electrical shorts. We grew semiconducting oxide films with low free-carrier concentrations to minimize quenching of the QD EL. The hole transport layer(HTL) and electron transport layer(ETL) were chosen to have carrier concentrations and energy-band offsets similar to the QDs so that electron and hole injection into the QD layer was balanced. For the ETL and the HTL, we selected a 40-nm-thick ZnSnOx with a resistivity of 10 Ω·cm, which show bright and uniform emission at a 10 V applied bias. Light emitting uniformity was improved by reducing the rpm of QD spin coating.At a QD concentration of 15.0 mg/mL, we observed bright and uniform electroluminescence at a 12 V applied bias. The significant decrease in QD luminescence can be attributed to the non-uniform QD layers. This suggests that we should control the interface between QD layers and charge transport layers to improve the electroluminescence.
URI
http://pubs.kist.re.kr/handle/201004/45839
ISSN
12250562
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE